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      1 // Copyright 2013 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #ifndef V8_TYPING_H_
      6 #define V8_TYPING_H_
      7 
      8 #include "src/v8.h"
      9 
     10 #include "src/allocation.h"
     11 #include "src/ast.h"
     12 #include "src/compiler.h"
     13 #include "src/effects.h"
     14 #include "src/scopes.h"
     15 #include "src/type-info.h"
     16 #include "src/types.h"
     17 #include "src/zone.h"
     18 
     19 namespace v8 {
     20 namespace internal {
     21 
     22 
     23 class AstTyper: public AstVisitor {
     24  public:
     25   static void Run(CompilationInfo* info);
     26 
     27   void* operator new(size_t size, Zone* zone) {
     28     return zone->New(static_cast<int>(size));
     29   }
     30   void operator delete(void* pointer, Zone* zone) { }
     31   void operator delete(void* pointer) { }
     32 
     33   DEFINE_AST_VISITOR_SUBCLASS_MEMBERS();
     34 
     35  private:
     36   explicit AstTyper(CompilationInfo* info);
     37 
     38   Effect ObservedOnStack(Object* value);
     39   void ObserveTypesAtOsrEntry(IterationStatement* stmt);
     40 
     41   static const int kNoVar = INT_MIN;
     42   typedef v8::internal::Effects<int, kNoVar> Effects;
     43   typedef v8::internal::NestedEffects<int, kNoVar> Store;
     44 
     45   CompilationInfo* info_;
     46   TypeFeedbackOracle oracle_;
     47   Store store_;
     48 
     49   TypeFeedbackOracle* oracle() { return &oracle_; }
     50 
     51   void NarrowType(Expression* e, Bounds b) {
     52     e->set_bounds(Bounds::Both(e->bounds(), b, zone()));
     53   }
     54   void NarrowLowerType(Expression* e, Type* t) {
     55     e->set_bounds(Bounds::NarrowLower(e->bounds(), t, zone()));
     56   }
     57 
     58   Effects EnterEffects() {
     59     store_ = store_.Push();
     60     return store_.Top();
     61   }
     62   void ExitEffects() { store_ = store_.Pop(); }
     63 
     64   int parameter_index(int index) { return -index - 2; }
     65   int stack_local_index(int index) { return index; }
     66 
     67   int variable_index(Variable* var) {
     68     // Stack locals have the range [0 .. l]
     69     // Parameters have the range [-1 .. p]
     70     // We map this to [-p-2 .. -1, 0 .. l]
     71     return var->IsStackLocal() ? stack_local_index(var->index()) :
     72            var->IsParameter() ? parameter_index(var->index()) : kNoVar;
     73   }
     74 
     75   void VisitDeclarations(ZoneList<Declaration*>* declarations);
     76   void VisitStatements(ZoneList<Statement*>* statements);
     77 
     78 #define DECLARE_VISIT(type) virtual void Visit##type(type* node);
     79   AST_NODE_LIST(DECLARE_VISIT)
     80 #undef DECLARE_VISIT
     81 
     82   DISALLOW_COPY_AND_ASSIGN(AstTyper);
     83 };
     84 
     85 } }  // namespace v8::internal
     86 
     87 #endif  // V8_TYPING_H_
     88